KR20110073148A - Air hammer for drilling machine - Google Patents
Air hammer for drilling machine Download PDFInfo
- Publication number
- KR20110073148A KR20110073148A KR20100006627A KR20100006627A KR20110073148A KR 20110073148 A KR20110073148 A KR 20110073148A KR 20100006627 A KR20100006627 A KR 20100006627A KR 20100006627 A KR20100006627 A KR 20100006627A KR 20110073148 A KR20110073148 A KR 20110073148A
- Authority
- KR
- South Korea
- Prior art keywords
- piston
- hammer
- main body
- air
- pneumatic
- Prior art date
Links
- 238000005553 drilling Methods 0.000 title claims abstract description 14
- 238000009826 distribution Methods 0.000 claims abstract description 59
- 230000000903 blocking effect Effects 0.000 claims abstract description 12
- 230000000149 penetrating effect Effects 0.000 claims abstract description 10
- 238000004080 punching Methods 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims description 19
- 230000002093 peripheral effect Effects 0.000 claims description 10
- 238000000638 solvent extraction Methods 0.000 claims description 2
- 238000009412 basement excavation Methods 0.000 description 6
- 239000011435 rock Substances 0.000 description 5
- 238000007599 discharging Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003028 elevating effect Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000009751 slip forming Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B4/00—Drives for drilling, used in the borehole
- E21B4/06—Down-hole impacting means, e.g. hammers
- E21B4/14—Fluid operated hammers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D9/00—Portable percussive tools with fluid-pressure drive, i.e. driven directly by fluids, e.g. having several percussive tool bits operated simultaneously
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
Air hammer of the drilling device of the present invention and the main body having a hollow;
A socket coupled to one side of the main body; And a piston guide part having a blocking part coupled to the main body, and an air supply passage extending in a direction parallel to the central axis of the main body from the blocking part, and having a discharge hole communicating with the air supply passage on an outer circumferential surface thereof. 1 bush member; A second bushing member installed at the other end of the main body, and a bit unit provided at the end of the second bushing member; A piston hole is formed through the upper and lower ends of the guide part and the second bushing member to be elevated, and guide holes penetrating in the longitudinal direction, and divide the main body space between the first and second bushing members into the first and second chambers. And an inlet passage portion formed at an upper end side of the second bush member to discharge air in the second chamber when the piston hammer is raised; It is formed in the piston hammer, the pneumatic distribution unit for raising and lowering the piston hammer selectively supplying the pneumatic pressure supplied through the pneumatic supply passage and the discharge hole of the piston guide portion of the socket and the first bushing member to the first and second chambers Air hammer for a punching device characterized in that it comprises a.
Description
The present invention relates to a perforation device, and more particularly, to a perforator air hammer installed at the end of the interconnection rod to perform an excavation work.
In general, the perforator includes a method of simply rotating the bit (also called an oscillator method), and a method of applying a pressing force while rotating the bit or ball cutter (R.C.D method). The oscillator method is a method of punching while rotating by the forward and backward operation of a cylinder installed in the left-right rotation direction while the casing having a diameter of 800 to 3000 mm is clamped with a hydraulic chuck, and the ROC method is provided with a bit or ball cutter at the end. It is a method of drilling by rotating a bit or ball cutter using a drive rod. The OSCILLATOR method is ideal for drilling an area consisting only of soil in the land condition of the workplace, but requires a process of dropping and destroying a large hammer by a separate equipment such as a navigator for studying rock in the ground. Do.
On the other hand, the RCD method has an advanced drilling effect compared to the oscillator method, a special bit attached to the end of the drill-de when excavating the soft rock and hard rock layer after excavating the soil layer with an oscillator or rotator (rotator) Rotating the rock to excavate the rock and drill rod pipe (drill) by circulating the water and crushed by air discharged to the ground excavated large diameter field casting and top down method used for foundation work, etc. It is a key method.
One example of an air hammer for performing a drilling operation is disclosed in US Pat. Nos. 3,941,196, US 0430554, and US3991834.
In the conventional air hammer, the hammer for hitting is lowered and hit in a state in which the hammer is separated from the guide. Thus, vibration occurs when the hammer is moved up and down. do. And there is a problem that the impact force is relatively large because there is no change of air for raising the piston at the top dead center when the air hammer is raised. In addition, there is a problem that the impact force of the bit is not uniform because the reaction force is relatively large when colliding with the bit unit.
Korean Patent Registration Publication No. 10-0372049 discloses an example of a drilling machine using a crane.
An object of the present invention is to provide an air hammer for a perforator that can reduce the vibration of the piston by shaking the piston by supporting the upper and lower parts of the piston hammer to solve the problems as described above.
It is another object of the present invention to provide a hammer for punching machines which can prevent brittleness due to quenching of the piston due to adiabatic expansion of air when air is supplied to the upper and lower chambers through the piston hammer, and furthermore, cause of crack generation. Has its purpose.
Another object of the present invention is to provide an air hammer for a perforator which can delay the time that the pressure reaches the highest point when the piston hammer is raised and lowered.
In order to achieve the above object, the air hammer for punching machine of the present invention,
A main body having a hollow portion;
A socket coupled to one side of the main body;
And a piston guide part having a blocking part coupled to the main body, and an air supply passage extending in a direction parallel to the central axis of the main body from the blocking part, and having a discharge hole communicating with the air supply passage on an outer circumferential surface thereof. 1 bush member,
A second bushing member installed at the other end of the main body, a bit unit provided at the end of the second bushing member;
A piston hole is formed through the upper and lower ends of the guide part and the second bushing member to be elevated, and guide holes penetrating in the longitudinal direction, and divide the main body space between the first and second bushing members into the first and second chambers. Equipped with
An inlet passage portion for discharging air in the second chamber is formed on the upper end side of the second bush member,
It is formed in the piston hammer, and selectively supply the pneumatic pressure supplied through the pneumatic supply passage and the discharge hole of the piston guide portion of the socket and the first bushing member to the first and second chambers to lift the piston hammer 50 A pneumatic distribution part is provided.
In the present invention, the discharge hole is gradually formed in the cross-sectional area in the upper and lower direction from the central portion of the discharge hole.
The pneumatic distribution portion is formed in the inner circumferential surface of the guide hole formed in the longitudinal direction are first and second distribution grooves spaced apart from each other, the first distribution groove and the first distribution hole penetrating the piston hammer from the outer peripheral surface of the piston hammer therefrom; The first distribution hole is formed on a portion of the outer circumferential surface of the piston hammer and connected to a connecting groove for forming a passage with the inner circumferential surface of the main body. The connecting groove is formed on the outer circumferential surface of the second chamber and the piston to form a first distribution groove. Connected to the
The second distribution groove is connected to the second distribution hole penetrating the piston hammer upwards from the outer peripheral surface of the piston hammer therefrom, the second distribution hole is formed on the outer peripheral surface of the piston hammer to communicate with the first chamber Connected with.
In addition, the outlet side of the first and second distribution grooves may have an enlarged portion whose cross-sectional area is gradually widened.
Perforated air hammer according to the present invention for achieving the above object alternative
Main body having a hollow part,
A socket coupled to one side of the main body,
And a piston guide part having a blocking part coupled to the main body, and an air supply passage extending in a direction parallel to the central axis of the main body from the blocking part, and having a discharge hole communicating with the air supply passage on an outer circumferential surface thereof. 1 bush member,
A second bushing member provided at the other end of the main body, a bit unit provided at the end of the second bushing member, and a guide portion and a second bushing member.
The piston guide portion is slidably installed to form a guide hole penetrating in the longitudinal direction, and the lower end portion is slidably supported by the second bushing member, and the main body space between the first and second bushing members is formed in the first and second bushing members. A piston hammer partitioning into the chamber,
Is installed on the upper end side of the second bush member is provided with an air discharge for discharging the air in the second chamber when the piston rises, is formed in the piston hammer to supply the second chamber when the piston descends and the It is characterized in that the pneumatic supply portion for supplying the pneumatic pressure in the first chamber.
The air hammer for the punching machine of the present invention supports the upper and lower sides of the piston when the piston hammer is lifted to prevent the piston hammer from being shaken and the force of the hammer is dispersed, and the inertia force can be relatively reduced when the piston hammer is raised.
In addition, when the pneumatic pressure is supplied to the first and second chambers, it is quenched by adiabatic expansion at the discharge port side of the first and second pneumatic supply passages, so that brittleness occurs in the piston hammer, thereby preventing damage easily.
1 is a side view showing a cloth mill according to the present invention,
2 is a cross-sectional view of the air hammer according to the present invention,
3 is an exploded perspective view of the air hammer shown in FIG.
4 is a perspective view showing an extract of the first bushing member;
FIG. 5 is a partially cutaway perspective view showing an extract of the piston hammer and the second bushing member shown in FIG. 2; FIG.
6 and 7 is a cross-sectional view showing an operating state of the air hammer according to the present invention,
Airhammer according to the present invention is installed on the drive rod of the perforator to provide a striking force for the excavation to the bit, an embodiment thereof is shown in Figures 1 and 2.
Referring to the drawings, the
The
The
The
The
The
The
And the
The
The upper end side of the
The
The
And the
The
And the
Therefore, the pneumatic pressure for raising the
And the
Preferably, the first and
Air hammer according to the present invention configured as described above is to perform the drilling operation in the state coupled with the
The action of the
As described above, the air pressure introduced into the second
When the
The air pressure is supplied from the
As described above, the pneumatic pressure of the
By repeating the operation as described above, the
Air discharged through the
As described above, the present invention supports the upper and lower portions of the
While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the scope of the invention.
Therefore, the true scope of protection of the present invention should be defined only by the appended claims.
Claims (4)
A socket coupled to one side of the main body;
And a piston guide part having a blocking part coupled to the main body, and an air supply passage extending in a direction parallel to the central axis of the main body from the blocking part, and having a discharge hole communicating with the air supply passage on an outer circumferential surface thereof. 1 bush member;
A second bushing member installed at the other end of the main body, and a bit unit provided at the end of the second bushing member;
The piston guide portion and the second bushing member is supported by the upper and lower ends are elevated to form a guide hole penetrating in the longitudinal direction, the piston for partitioning the main body space between the first and second bushing member into the first and second chambers. With a hammer,
A pneumatic exhaust portion formed at an upper end side of the second bush member supporting the lower end of the piston hammer to discharge air in the second chamber when the piston hammer is raised;
It is formed in the piston hammer, the pneumatic distribution portion for lifting the piston hammer by selectively supplying the pneumatic pressure supplied through the pneumatic supply passage and the discharge hole of the piston guide portion of the socket and the first bushing member to the first and second chambers Air hammer for a punching device characterized in that it comprises a.
The discharge hole is air hammer for a punching device, characterized in that the cross-sectional area is formed from the central portion toward the upper and lower sides of the piston guide portion.
The pneumatic distribution portion is formed in the inner circumferential surface of the guide hole formed in the longitudinal direction are first and second distribution grooves spaced apart from each other, the first distribution groove and the first distribution hole penetrating the piston hammer from the outer peripheral surface of the piston hammer therefrom; The first distribution hole is formed on a portion of the outer circumferential surface of the piston hammer and connected to a connecting groove for forming a passage with the inner circumferential surface of the main body. The connecting groove is formed on the outer circumferential surface of the second chamber and the piston to form a first distribution groove. Connected to the
The second distribution groove is connected to the second distribution hole penetrating the piston hammer upwards from the outer peripheral surface of the piston hammer therefrom, the second distribution hole is formed on the outer peripheral surface of the piston hammer to communicate with the first chamber Air hammer for drilling device, characterized in that connected with.
The pneumatic discharge portion is formed with a plurality of first passage portions in the longitudinal direction from the upper surface of the second bush member, the second passage portion circumferentially drawn from the inner circumferential surface on the end side of the first passage portion is formed in the second bush member Air hammer for punching device.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR20100006627A KR101178277B1 (en) | 2009-12-22 | 2010-01-25 | air hammer for drilling machine |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/KR2009/007692 WO2011078421A1 (en) | 2009-12-22 | 2009-12-22 | Air hammer for a boring machine |
IBPCT/KR2009/007692 | 2009-12-22 | ||
KR20100006627A KR101178277B1 (en) | 2009-12-22 | 2010-01-25 | air hammer for drilling machine |
Publications (2)
Publication Number | Publication Date |
---|---|
KR20110073148A true KR20110073148A (en) | 2011-06-29 |
KR101178277B1 KR101178277B1 (en) | 2012-08-29 |
Family
ID=44195929
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
KR20100006627A KR101178277B1 (en) | 2009-12-22 | 2010-01-25 | air hammer for drilling machine |
Country Status (9)
Country | Link |
---|---|
US (1) | US9103164B2 (en) |
EP (1) | EP2518255B1 (en) |
JP (1) | JP5373205B2 (en) |
KR (1) | KR101178277B1 (en) |
CN (1) | CN102686820B (en) |
AU (1) | AU2009357364B2 (en) |
CA (1) | CA2784979C (en) |
RU (1) | RU2012131120A (en) |
WO (1) | WO2011078421A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101378379B1 (en) * | 2012-03-20 | 2014-03-27 | 주식회사 대창중기계 | Hammer drill of excavaton |
KR101399384B1 (en) * | 2013-01-31 | 2014-05-27 | 주식회사 성원중기계 | Down the hole hammer device for using compression air |
KR20190131890A (en) * | 2018-05-18 | 2019-11-27 | (주)한진디엔비 | Horizontal directional drilling method using water hammer directional drilling assembly |
Families Citing this family (15)
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CN102966305B (en) * | 2012-12-11 | 2014-12-31 | 闫铁 | Near-bit circumferential resonance impacter |
EP2873489B1 (en) * | 2013-11-13 | 2018-10-24 | Sandvik Mining and Construction Oy | Impact device and method of dismounting the same |
CN103628815B (en) * | 2013-11-20 | 2016-03-30 | 中国石油集团渤海钻探工程有限公司 | A kind of nearly drill bit reverses, Oscillatory Coupling impactor |
KR101629294B1 (en) * | 2014-09-18 | 2016-06-10 | 창신인터내셔날 주식회사 | Hammer for drilling |
KR101592238B1 (en) | 2015-07-20 | 2016-02-11 | 주식회사 성원중기계 | Hammer bits for excavators |
KR101596660B1 (en) | 2015-07-31 | 2016-02-23 | 차수익 | Apparatus and method for removing waste PHC pile of reclaimed land |
CN106894415B (en) * | 2017-03-13 | 2019-08-09 | 东台市汉友机械有限公司 | Hand-held automatic lifting piling (well-digging) pile pulling all-in-one machine |
CN106941796B (en) * | 2017-04-10 | 2019-10-25 | 扬州大学 | A kind of self-propelled pneumatic soil-loosening fertilizer applicator |
CN107041177B (en) * | 2017-04-10 | 2019-09-27 | 扬州大学 | A kind of fertilizer apparatus and method of pneumatically loosening the soil |
CN107027360B (en) * | 2017-04-10 | 2019-10-25 | 扬州大学 | A kind of pneumatic chiselling fertilizer applicator of packaged type |
CN107027359B (en) * | 2017-04-10 | 2019-08-20 | 扬州大学 | A kind of pneumatic chiselling fertilizer applicator |
EP3754152B1 (en) | 2019-06-20 | 2022-02-16 | Sandvik Mining and Construction Oy | Down the hole drilling assembly exhaust assembly |
SE1951244A1 (en) * | 2019-10-31 | 2021-04-20 | Epiroc Drilling Tools Ab | Pneumatic drill hammer comprising a boost chamber and a drilling rig comprising such a drill hammer |
CN113250604B (en) * | 2021-06-29 | 2023-10-13 | 重庆科技学院 | Self-air-distribution cluster type pneumatic down-the-hole hammer set |
KR102667641B1 (en) | 2023-01-05 | 2024-05-21 | 주식회사 엠에스이엔씨 | Tunnel excavation hammer with excellent durability iand tunnel excavation method using the same |
Family Cites Families (24)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3871486A (en) | 1973-08-29 | 1975-03-18 | Bakerdrill Inc | Continuous coring system and apparatus |
US3991834A (en) | 1975-07-07 | 1976-11-16 | Curington Alfred R | Sampling airhammer apparatus |
US4030554A (en) | 1975-07-07 | 1977-06-21 | Bakerdrill, Inc. | Bore hole airhammer and anvil bit |
GB1585086A (en) * | 1976-07-28 | 1981-02-25 | Compair Constr Mining Ltd | Down-the-hole percussion drills |
DE3170268D1 (en) * | 1980-07-01 | 1985-06-05 | Greame Rear Ian | Improved fluid operated hammer |
JPS59114393A (en) * | 1982-12-20 | 1984-07-02 | 株式会社利根ボ−リング | Air impact type drilling apparatus |
US4932483A (en) * | 1988-02-16 | 1990-06-12 | Ian G. Rear | Down hole hammer |
US5238073A (en) * | 1991-04-04 | 1993-08-24 | Rear Ian G | Uphole hammer |
US5205363A (en) * | 1991-05-16 | 1993-04-27 | Pascale Jack H | Porting system for pneumatic impact hammer |
USRE36848E (en) * | 1992-07-17 | 2000-09-05 | Smith International, Inc. | Air percussion drilling assembly |
US5322136A (en) * | 1992-07-17 | 1994-06-21 | Smith International, Inc. | Air percussion drilling assembly |
USRE36166E (en) * | 1992-07-17 | 1999-03-30 | Smith International, Inc. | Air percussion drilling assembly for directional drilling applications |
US5305837A (en) * | 1992-07-17 | 1994-04-26 | Smith International, Inc. | Air percussion drilling assembly for directional drilling applications |
US6062322A (en) * | 1998-06-15 | 2000-05-16 | Sandvik Ab | Precussive down-the-hole rock drilling hammer |
SG97991A1 (en) * | 1999-12-03 | 2003-08-20 | Tone Kk | Multiple air hammer apparatus and excavating direction correcting method therefor |
KR100372049B1 (en) | 2000-08-03 | 2003-02-14 | 주식회사 경인 | Perforator by using a crane |
KR100562954B1 (en) * | 2004-03-24 | 2006-03-22 | 인석신 | water hammer of a boring machine |
WO2006062309A1 (en) * | 2004-12-07 | 2006-06-15 | Byung-Duk Lim | A ground drilling hammer and the driving method |
KR100675851B1 (en) * | 2005-04-08 | 2007-01-30 | 임병덕 | An air-hammer for drilling earth and the operating method |
KR100642073B1 (en) * | 2004-12-07 | 2006-11-10 | 임병덕 | A ground drilling hammer and the driving system of the hammer |
CN2937437Y (en) * | 2006-08-15 | 2007-08-22 | 新疆石油管理局钻井工艺研究院 | Air impact hammer |
CN201016269Y (en) * | 2007-01-30 | 2008-02-06 | 新疆石油管理局钻井工艺研究院 | Air jump bit for oil gas drilling well |
CN101363305A (en) * | 2008-10-07 | 2009-02-11 | 西南石油大学 | Long-life high performance air hammer |
JP3156165U (en) * | 2009-10-06 | 2009-12-17 | 文男 星 | Cycle hammer for drilling hard rock ground |
-
2009
- 2009-12-22 EP EP09852620.5A patent/EP2518255B1/en not_active Not-in-force
- 2009-12-22 JP JP2012545824A patent/JP5373205B2/en active Active
- 2009-12-22 AU AU2009357364A patent/AU2009357364B2/en not_active Ceased
- 2009-12-22 US US13/514,267 patent/US9103164B2/en active Active
- 2009-12-22 CN CN200980163110.7A patent/CN102686820B/en not_active Expired - Fee Related
- 2009-12-22 RU RU2012131120/03A patent/RU2012131120A/en unknown
- 2009-12-22 WO PCT/KR2009/007692 patent/WO2011078421A1/en active Application Filing
- 2009-12-22 CA CA 2784979 patent/CA2784979C/en not_active Expired - Fee Related
-
2010
- 2010-01-25 KR KR20100006627A patent/KR101178277B1/en active IP Right Grant
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101378379B1 (en) * | 2012-03-20 | 2014-03-27 | 주식회사 대창중기계 | Hammer drill of excavaton |
KR101399384B1 (en) * | 2013-01-31 | 2014-05-27 | 주식회사 성원중기계 | Down the hole hammer device for using compression air |
KR20190131890A (en) * | 2018-05-18 | 2019-11-27 | (주)한진디엔비 | Horizontal directional drilling method using water hammer directional drilling assembly |
Also Published As
Publication number | Publication date |
---|---|
US20120261151A1 (en) | 2012-10-18 |
EP2518255A4 (en) | 2015-04-08 |
CN102686820B (en) | 2014-10-01 |
JP2013515182A (en) | 2013-05-02 |
JP5373205B2 (en) | 2013-12-18 |
CA2784979A1 (en) | 2011-06-30 |
CA2784979C (en) | 2015-02-03 |
AU2009357364A1 (en) | 2012-08-02 |
US9103164B2 (en) | 2015-08-11 |
KR101178277B1 (en) | 2012-08-29 |
CN102686820A (en) | 2012-09-19 |
AU2009357364B2 (en) | 2014-01-16 |
RU2012131120A (en) | 2014-01-27 |
WO2011078421A1 (en) | 2011-06-30 |
EP2518255B1 (en) | 2016-04-20 |
EP2518255A1 (en) | 2012-10-31 |
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